Sewing-machine presser foot



P 9, 1951 v. M. GINWRIGHT 2,548,361

SEWING MACHINE PRESSER FOQT Filed May 23, 1949 2 Sheets-Sheet 1 Victor M. (linwrzyhi,

' ATTORNEY.

April 1951 v. M- IGINWRIGHT 2,548,361

sswmc MACHINE PRESSER FOOT Filed May 25, 1949 2 Sheets-Sheet 2 ATTbRNEY.

Patented Apr. 10, 1951 UNITED STATES PATENT OFFICE Application May 23, 1949, Serial No. 94,821

My invention which relates generally to the art of sewing machines more particularly involves the presser foot which cooperates with the feed dog in passing the fabric by the needle.

Heretofore considerable difficulty has been encountered in sewing straight seams on sheer fabrics, often resulting in gathered effects. It is, therefore, one of the objects of my invention to improve the sewing, eliminate the gathered effects and produce straight even seams.

With machines employing the usual rigid presser foot bottoms there is a drag on the top piece of fabric while the dog exerts a pull on the lower piece. This results in puckering of the fabric unless the operator is exceptionally skilled and attentive to her Work. It is therefore another object of my invention to so improve the machine that the training period for operators may be materially reduced, since with machines using my invention the operators do not have to be taught to hold a certain tension on the bottom piece of fabric and none On the top to make both top and bottom come out even.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends invention still further resides in the novel details of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, and then be particularly pointed out in the appended claims, reference being had to the accompanying drawings, in which:

Fig. 1 is a perspective view of a portion of a sewing machine embodying my improvement.

Fig. 2 is an enlarged detail View of the presser foot, feed dog and needle.

Fig. 3 is an inverted perspective view of a presser foot showing one embodiment of my invention.

Fig. 4 is a cross section on the line 4-4 of Fig. 3.

Fig. 5 is a top plan view of the presser foot shown in Fig. 3.

Fig. 6 is a view similar to Fig. 2 but showing a second embodiment.

Fig. '7 is a view similar to Fig. 3 showing the embodiment illustrated in Fig. 6.

Fig. .8 is a cross section on the line 8-8 of Fig. 7.

Fig. 9 is a view similar to Fig. 5 but showing the second embodiment of my invention.

In the drawings in which like numerals indicate like parts in all the figures, I is the presser foot of a sewing machine which is pivoted on 6 Claims. (Cl. 112-235) Reading, Pa., a corpoa rod I and held down by a suitably mounted spring 8, while 2 indicates the needle that is mounted on a rock shaft 2 actuated from the driven shaft 5 by an eccentric 5 crank 2 and connecting rod 5*.

3 is the feed dog which is also operated from shaft 5 via an eccentric I and a crank 6, the eccentric I operating via direct 001111601710113 while the crank 6 operates via a connecting rod 6*, a rocking bar 6 and connecting rod 6 as indicated in Fig. 1. All these parts sofar described (except the presser foot per se) are of known construction and are per se not of my invention.

The presser foot I embodies my invention and by reference to Figs. 1 to 5 inclusive the first embodiment of my invention will be understood.

In Fig. 2 the table or bed of the sewing machine is indicated by the line It), the two pieces of fabric to be sewn together are indicated by 9 and II. The presser foot I has a dovetail groove or slideway I? cut longitudinally in its underside and a slot I cut through the foot. A dovetail slide I3 is placed in the groove or slideway I and a pin I passed through the slot I and secured in the slide so that the slide may be moved back and forth along the slideway. A spring 4 is attached to a stud I on the top side of the presser foot I and to the pin I to constantly, yet yieldably, tend to move the presser foot in a backward direction.

The exposed face of the slide I3 in the first form of my invention is smooth-for those machines for sewing sheer fabrics and such face may if desired lie flush with the corresponding surface of the presser foot or lie slightly above or below the same if desired, so long as the slide is positioned directly above the feed dog 3.

For machines for sewing heavy fabrics the underface of the slide may be provided with a set of fine teeth I4 (Figs. 6 to 10 inclusive).

In sewing sheer fabrics, however, the smooth surface slide will reduce the danger of cutting the fabrics by the feed dog since lower pressure is required on sheer fabrics with my invention.

In Figs. 6 to 10 of the drawings those parts which correspond to like parts in the preceding figures bear the same reference character plus the index letter :1:.

While I have illustrated my invention as applied to one known type of machine it is obvious that it may be used on any sewing machine employing a feed dog and cooperating presser foot and I do not wish to be limited in that respect.

From the foregoing description, taken in connection with the accompanying drawings, it is thought that the construction, operation and advantages of the invention will readily appear to those skilled in the art.

What I claim is:

1. In a sewing machine having a feed dog, a presser foot cooperating with said dog to feed fabric through the machine, said presser foot having in its underside a slideway, a slide of ap' proximately the same width as that of the feed dog in said slideway for engaging the fabric while the machine is in operation by virtue of all of which as the feed dog moves-the fabric forwardly said slide will also be moved forwardly,

and means to return the slide to its starting place when pressure on said slide is relieved.

2. In a sewing machine having a feed dog, a presser foot cooperating with said dog in feeding fabric through the machine, said presser foot having in its underside a dovetailed slideway, a dovetailed slide of approximately the same width as that of the feed dog in said slideway for engaging the fabric while the machine is in operation by virtue of all of which as the feed dog moves the fabric forwardly said slide will also be moved forwardly, and means to return the'slide to its starting place when said dog is released from the fabric.

3. In a sewing machine having a needle, a feed dog and a presser foot cooperating with the feed dog in feeding fabric past the needle; the improvement which comprises a presser foot having a slideway on its underface directly in line with the feed dog, a fabric engaging slide of approximately the same width as that of the feed dog operating in said slideway and movable in one direction with the cloth being moved by the feed dog and yieldable means continuously tending to move said slide in the opposite direction.

4. In a sewing machine having a needle, 2. feed dog and a presser foot cooperating with the feed dog in feeding fabric past the needle; the improvement which comprises a presser foot having a slideway in its underface directly in line with the feed dog, a fabric engaging slide of approximately the same width as that of the feed dog operating in said slideway and movable in one direction with the cloth being moved by the feed dog and yieldable means continuously tending to move said slide in the opposite direction, said slide having its cloth engaging face smooth.

5. In a sewing machine having a needle, a feed dog and a presser foot cooperating with the feed dog in feeding fabric past the needle; the improvement which comprises a presser foot having a slideway in its underface directly in line with the feeddog, a fabric engaging slide of approximately the same width as that of the feed dog operatingv in said slideway and movable in one direction with the cloth being moved by the feed dogandy'ieldable means continuously tendingto move said slide in the opposite direction, said slide having its cloth engaging face toothed.

6. In a sewing machine having a needle, a feed dog and a presser foot cooperating with the feed dog in feeding fabric past the needle; the improvement which comprises a presser foot having a slideway on its underface in line with the feed dog, a fabric engaging slide operating insaid slideway and movable in one direction with the cloth being moved by the feed dog, said pres-' ser foot having a slot, said slide having a pin passing through said slot and a spring connecting said pin with said presser foot for yieldably tending to move said slide in the opposite direction.

VICTOR M. GINWRIGI-IT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 494,224 Philbrick Mar. 28, 1893 945,308 Emery Jan. 4, 1910 

